AEBS (802.11n model) and Airport Express both disappeared

My Airport Extreme network worked properly yesterday. My Airport Extreme Base Station (new 802.11n model) is connected to a Motorola Canopy terrestrial antenna dish (via the WAN port) which is the DHCP server. It is also connected to my printers and wired computers via one of the LAN ports and an 8-port Ethernet Switch. The Airport Express is being used to connect my home entertainment receiver; I just added the Airport Express into the network yesterday and it worked great with both iTunes and Airfoil yesterday.
Today the green light was still on on the Airport Express, but iTunes could not find it. I tried to use AirPort Utility, but it says "AirPort Utility was unable to find any AirPort base stations." AirPort Utility can't even find the main base station even though I am wirelessly connected to the internet right now through it! The light on the Airport Express is now flashing yellow (it is not working at all other than flashing its light)
I am running the AirPort Utility from a 12" PowerBook G4. All of my Macs are PowerPC at present, so I am not yet utilizing the 802.11n (just 802.11g and wired Ethernet).
I guess I will need to setup the AirPorts again. How can I get the settings to stick so that I won't have to reset them on a daily basis? I am not sure what went wrong here.

I had the same issue as a lot of you with my Airport Expresses.
When you first set up your Airport Express did you use the new Airport Utility that comes with the 802.11n Base Station or did you use the Old Utility?
What I ended up doing was resetting my Airport Express to the Factory Defaults, then using my Airport Connection (top Right corner) choose the Airport Express from there, it's going to be a Apple SSID/Network name, and then resetup the Airport Express with the NEW Airport Utility.
Haven't had an issue with any of my connections. I have 2 Airport Express, one as a client and one as a WDS Remote Station.
I also live in a apartment, and my Macbook picks up 12 different Access Points. But haven't had any problems with drop offs or disconnects after reseting my Expresses and resetting them up with the Airport Utility that comes with the 802.11n Extreme.
Hope that helps,
AL

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